Selector



E. A. WIBERG March 7, 1950 SELECTOR Filed Jan. 15, 1947 .IZLZJJZ'ZOZ $.15 Hi5 91 3 Patented Mar. 7, 1950 SELECTOR Eric Axel Wiberg, Stockholm, Sweden, assignor to Telefonaktiebolaget L. M. Ericsson, Stockholm, Sweden, a company of Sweden Application January 15, 1947, Serial No. 722,241

In Sweden February 27, 1946 1 Claim. 1

The present invention refers to an electromagnetically driven selector, especially for telephone plants, by means of which an arbitrary contact set among a number of sets lying beside each other can be operated.

The invention is chiefly characterized in that there is for each contact set a guide which, in active position at make and break of the selector magnet, actuates the pertaining contact set by means of a lifting member, and causes a displacement of the following guide from normal position to active position.

The invention will be described more closely with reference to the accompanying drawing. Fig. 1 shows a perspective view of the selector. Figs. 2 and 3 illustrate a front view and a side view of the selector, and Fig. 4 shows an enlarged detail of the contact actuating device in the selector.

On a relay bridge I, Fig. 1, there is an electromagnetic relay 2, the armature 3 of which supports a bar 4, provided with holes 5. Two studs 6 and I, provided with lips or teeth, are fastened on said bridge, on which a number of guides 8, 9 are also arranged. The number of guides as well as the number of said teeth and holes in the bar corresponds to the number of selector positions or contact sets. Above each guide there is a lifting spring 10, on which a lifting bar H rests. The bar II is provided in a usual way with recesses for contact springs l3, Fig. 3. Said contact springs are omitted in Fig. 1. On a bar lifting, the contacts in the corresponding contact spring set are actuated. The guides are made with a certain pro-tension, which causes them to rest against their support with a pressure, which is directed downwards and to the right, Fig. 1. The stud 1, Figs. 1 and 3, is shaped with inclined planes. At their initial position the guides pass through the holes in the armature bar and come out below the pertaining inclined plane in the stud 1. When a guide is lifted up to its active position, it glides upwards along the underside of inclined plane. When it has reached the upper end of the plane, it snaps its point onto the upper side of the plane. If the guide is thereafter moved downwards, it will glide along the upper side of the plane and then back to its initial position. Each lifting spring I0 is shaped with a tongue is lying below the nearest guide, and the object of which is, on movement upwards of the lifting spring, to lift the following guide from its initial position to a position on a tooth on the bar 6. A lifting spring, which is being moved upwards, thus causes the follow- 2 ing lifting spring to be actuated the next time, a step by step actuation of the contact sets lying in a row thus being obtained.

Supposing that the armature of the electromagnet is at make position, one of the guides is always lifted from its in tial position 25, Fig. 4, and lies in said position I! on a tooth on the stud 6. It presses with a certain pressure on the lower part of the right sidewall in the hole 5 of the armature bar. On the armature thereafter being moved to break position, the armature bar will move downwards and so will the hole 5, in the upper part of which the right sidewall is offset to the right. The guide will glide from position I! to position l8 after the hole 5 moves a certain distance downwards. The guide now reaches an active position. It follows namely the armature upwards on its movement upwards to position 20 and thereby lifts the corresponding spring l0 and the bar I I on top of it and lifts the contact spring 13, the contact set in question thus being operated. During the movement upwards of the lifting spring Ill, its tongue [9 actuates the next following guide, so that it is lifted from its initial position 2| to a position 23 on a tooth on the stud 6, the actuation of the next contact set thus being prepared. The above mentioned guide, which followed the hole 5 upwards, hits the lower surface of the inclined plane 24 before reaching position 20. It follows said surface until reaching its top edge, whereafter it snaps over said edge and is set in position 20 on the upper side of the plane. On the armature thereafter releasing, the guide glides along the upper side of plane 24, simultaneously being pressed downwards partly by the upper edge of the hole in the bar, and partly by the spring pressure in the lifted contact springs. As soon as the guide has finally left the lower edge of the plane 24, it falls, due to its pre-tension, down towards the stud 6 and assumes its initial position 25.

The following guide which, as mentioned above, has been lifted into a position 23, makes in the above described way a movement first to position 21 and thereafter round the plane 24 back to its initial position. On the corresponding lifting spring meanwhile being operated, the actuation of the next following guide is prepared. On the lifting spring in the contact sets which lies furtherest to the right being actuated, the lifting spring transfers by means of a link I2, Fig. 1, the preparing movement for actuation of the following guide onto the guide 8, lying furtherest 3 to the left, said guide thereby being lifted to a preparatory position on a tooth on the stud 6.

I claim:

An electric selector for telephone plants comprising a plurality of adjacent contact sets successively actuated, a relay-magnet-common to the several sets, a guide for each contact se't movable from an initial position to'an active position, a lifting member for the contacts in each set arranged to be moved, on make and break-i0 means for guiding the guide back to the initial position after the appertaining contact setlhas' been actuated.

ERIC AXEL WIBERG- 4 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,127,322 Blomberg Aug. 16, 1938 2,309,422 Vigren et a1 Jan. 26, 1943 2,367,101 Vigren et a1 Jan. 9, 1945 2,438,042 Edgerton Mar. 16, 1948 FOREIGN PATENTS Number Country Date 2253332 Great Britain Dec. 11, 1924 

